Method of making electrical connectors



Jim. 9, 1968 Q C. (5. LIFKA 3,362,366

METHOD OF MAKING ELECTRICAL CONNECTORS Filed Feb. 15', 1965 FlG.2

INVENTOR CHARLES e. LIFKA- QM. 910%; 00 BY ATTORNEYS United States Patent 3,362,366 METHOD OF MAKING ELECTRICAL CONNECTORS Charles G. Lifka, Boca Raton, Fla, assignor to Charles G. Lifka, trustee, Detroit, Mich. Filed Feb. 15, 1965, Ser. No. 432,512 1 Claim. (Cl. 113-116) ABSTRACT OF THE DISCLOSURE A method for forming a shell for an article like that disclosed in FIG. 4 of Patent 2,986,060 of May 30, 1961, wherein the side wall thread is rolled before the bottom is cut out and before the bottom edge is double beaded; and wherein a flat lateral flange is formed radially before the bottom edge is double beaded.

. A connector such as is here disclosed in FIG. 3, comprises a shell 10, a locking ring 11, and a collar 12, with the parts in the completed assembly being shown in the Waring Patent 2,458,276 as well as in FIG. 3 hereof.

The method herein disclosed for making such connector is as follows:

The shell of FIG. 2 is produced from a flat, thin, metal sheet, by drawing into a cylindrical cup form as in FIG. 1. A thread is rolled in the sidewall of the cup form. Disc 16 which a portion of forms the bottom of the cup form of FIG. 1 is cut out leaving a radially inwardly extending bead and the bead at the lower edge of the cup form where the disc was removed is rolled inwardly as shown at double bead 18, FIG. 2. The upper edge of the cup form is radially outwardly flanged as shown at 20 and is later drawn axially upwardly as shown at 22 in FIG, 2 to form an internal shoulder 24, When 3,362,366 Patented Jan. 9, 1968 all these steps have been completed there is produced the completed shell of FIG. 2.

Thereafter to form the completed connector, a locking ring 11 is inserted into the completed shell of FIG. 2 and rested on the shoulder 24 as shown in FIG. 3.

Thereafter a collar 12 having an outwardly flanged lower edge 26 is inserted into the shell on the locking ring 11 on the shoulder 24 of the shell With flange 26 of the collar resting on the locking ring 11.

Finally the enlarged upper edge 22 of the shell is rolled inwardly over the flange 26 of the collar to complete the assembly.

The method herein disclosed is extraordinarily simple. All of the steps of forming the shell may be performed in a single well-known machine known as an eyelet machine which in one continuous series of steps performs all of the steps necessary to form the completed shell of FIG. 2, starting from a flat, thin metal sheet, with the shell having its bottom cut out, its lower edge rolled inwardly, its sidewall formed with rolled threads and its upper edge flanged outwardly and upwardly, all as shown in FIG. 2.

Now having described the method hereof, reference should be had to the claim which follows.

I claim:

1. A method for making a shell comprising:

drawing a cylindrical cup form from a flat, thin metal sheet with said cup form having a flat circular bottom;

rolling a thread in the sidewall of the cup form;

cutting out the disc forming the bottom of the threaded cup form inwardly of the sidewall to leave a radially inwardly extending bead thereon;

outwardly flanging the upper edge of the cup form radially and laterally to form a radially outwardly extending flat flange;

and rolling said head on the lower edge of the threaded cup form where the disc was removed to the inside of the cup form to form a double bead thereon;

all this forming the shell.

References Cited UNITED STATES PATENTS 1,867,412 7/ 1932 Klocke. 2,185,216 1/ 1940 McManus et al. 2,232,098 2/ 1941 Deichman. 2,458,276 1/ 1949 Langley et al. 285-161 2,986,060 5/1961 Lifka 285-161 876,361 1/ 1908 Kraft et al.

CHARLIE T. MOON, Primary Examiner. 

